cant load a day z game?

[armateam397397 0]

im on six launcher i try joining different games but in the middle of it loading when im trying to join it says bad serial number givin in setup

i have tried reopening it but still keep saying bad serial number givin in setup

any of u guys no how to fix it if u do could u please leave a comment and

i spent 30$ on it and i would really like to play day-z for my first time whole reason why i got it

and it might be partly because i cant open operation arrow head and im pretty sure it becuase of that because when that bad serial number givin in setup thing pops up it has a picture the operation arrow head any ideas plz help fast i wanna play it